boolean isManifestUpdated() {
if (!mCacheFile.exists()) {
Log.i("ManifestCheckerService", "updated: cache file does not exist");
return true;
}
try {
MessageDigest dataDigester = MessageDigest.getInstance("MD5");
dataDigester.update(mFetcher.getData(), 0, mFetcher.getDataLen());
byte[] dataDigest = dataDigester.digest();
MessageDigest fileDigester = MessageDigest.getInstance("MD5");
FileInputStream is = new FileInputStream(mCacheFile);
byte[] buf = new byte[4096];
int len;
while ((len = is.read(buf)) > 0) {
fileDigester.update(buf, 0, len);
}
is.close();
byte[] fileDigest = fileDigester.digest();
if (Arrays.equals(dataDigest, fileDigest)) {
return false;
}
Log.i("ManifestCheckerService", "updated: digests differ");
} catch (Exception e) {
Log.e("ManifestFetcher", "caught exception: " + e.getMessage());
e.printStackTrace();
}
return true;
}
void writeManifest() {
try {
FileOutputStream os = new FileOutputStream(mCacheFile);
os.write(mFetcher.getData(), 0, mFetcher.getDataLen());
os.close();
} catch (Exception e) {
Log.e("ManifestFetcher", "caught exception: " + e.getMessage());
e.printStackTrace();
}
}
private void startCheck() {
if (mFetcher == null) {
Handler handler = new ManifestFetcherHandler(this);
mFetcher = new ManifestFetcher(this, handler);
mFetcher.start();
}
}
